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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '824a91480a290a1554b123f41421ba3ae8a61666ce1e906f80206e011a25dc03' 
  AND token = '+H6a7SpmOMfgaHgEtB+Lo5TQy7cQO+dh8Fko2LAcPF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}