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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca856fa1cd9dc2c1d18dcdde8b8988a857bf158ebbd8f6ca42cc8266f39f297d' 
  AND token = '+Ib0X1gpUJoxnvgrBbtgE8f09s6vSsn9w/9ISqEt6qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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