SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f524b08912fe54659bf205126f59addc90088d406838a7c2e725abbf62753f4b' 
  AND token = 'wPF3Bb7AFuqmtwvSJfp0Weh7/TMwCm0u3HGSQr7W5yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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