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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37fb14254e34f1cf53e4cbb20b2632d62d6de29536fa1719c384fb6004001a85' 
  AND token = 'BlfuSe6TV5hdtNrBqi+R95UzTsHKfTnrm4CQAO4Gbl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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