SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97cc4c565c426a1ced3a21c9608b3153f97649b72b797c56761e2b30b66dc680' 
  AND token = 'ijNTDPY5K8GHx4sp3Xl9G505h+LOKvCFT933DK/AAow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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