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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '894252b7415e1c77ca5f075488c1f8a44c60095587474e5eb06f8110f8b1f354' 
  AND token = 'JiCtH39ribN7z7SmT7B9WMGH3YAggKREAaqSYXRFm9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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