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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33abba9b9407247e5206b2590309dc9497127744eee4798bc29fc44662dc0dbd' 
  AND token = 'E1EZvhkw12qgORfYeNP3EbySP3IfqD1ellQ5IU9VlQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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