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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b5edc0fec66b9b1d85377fa74742109f5978e2fc7d2dfd12b946cf5d6cd3246' 
  AND token = '17YbsNBMR3AeoZ5ljhaCqdIYskFbN2ZUsVfeVlGz4ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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