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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73567d6efeb72bbf85b29e64c23f58454d4b94288742be4862193e7a9874ef74' 
  AND token = 'dj2IUIvJM8iWlGyQobrlLFFl/GVroUsHR0+wvQQ3SNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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