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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8007fd1cf314652a91e9946acc60551f462c17da38a784cad5a3b6fb1afcaa4e' 
  AND token = '1nkrf33/0heaYaMTr+YnQclw38ZXIWYZ2DGZ02YRhcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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