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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a86a8951dd55d7c56cb50d970ebe7b8055dfddd541fb2ae762667ae4e5bd365' 
  AND token = 'OfYN5ujnkhW7v1EDIoXg4TFL5vzCxBbPcVug412jfO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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