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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1f4a3c288d60d6089d9426a6e5b666c8854aa1e1bf6762d6df2d97a8c6b6de2' 
  AND token = 'IJglHkPgwwj2FWIiFVv5HTKT2u2NpGZd29luAP+6HX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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