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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '616598711fc2b6d927614c078b0d464524fa1335645556ae1ca27203ec83cc36' 
  AND token = 'DbH5vkwYo51E+JwdukWhObBcbN0wz+w+DjKk6VX0orc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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