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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd7a6d54cfbcbd5f2476192cf0e74307ea4987065ae201cb603b079ef7267f48' 
  AND token = '0XvF+533zbJ+/Lm6xVLL1NE7Y2r9TRzsXMJw3o+Sy18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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