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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cfd81639e768de631172c32ac23ac9c8f4f6e20172fe6c6190c670606782cd3' 
  AND token = 'MQWvwqiA7gISzzKE4fSzdrThW2/uaFev9DqqXS+Uwsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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