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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04ef7795070ce6a8b876388ef766d8be9466603157b644f1f7692c0e1bf405cf' 
  AND token = 'L/Tb5P91IKj9lC7Q5z4R2LTUnlMtm4IeitF3yQHniL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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