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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33a30ea68f489350ae146c3d7fd58018e5c61742b9d66755f983d2b244eae770' 
  AND token = '79qLan6EFMFpkjuj7uHiMMj8OxQvGAguz+qE33DQaTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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