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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9f5355abc31601db88e570d64c0ca916ff1355928f3379fcd39d0840eb9c61b' 
  AND token = '+URj8sz5fKD/a9tvx0CWcPEv9UoF8YLD+VXRomCP8Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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