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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4157b73780656900baf727c5fa91c133fddfc436ea2dc4a03504b5fda644fbf' 
  AND token = 'dodtFM40IgrO47uWPJUmx4ylKQ5TrdQTqXYj+UFrLIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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