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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '604b61acc9e1379b2cfabad07a0d9aafa17170c75c5ba23c9c41b7eee21a32ba' 
  AND token = 'VONMxrHFXyOCzXMvPaiGee4LI29ntypsLW46ibJN00k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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