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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94cbd72436a049b0a73be943c7eb5bfe7a91556248c6fb2a96f8c6aff41fc437' 
  AND token = '6A6puKJG8v177d1m/x5qQdtFikrF2QZ8/a8FAiIaA/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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