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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c4e7ea8e640cc5b0878194bc52043aef5c44f5216317ffceb3c2f98208e9326' 
  AND token = 'OERGJD5Bc6TeUuO48D+N/NhgDaRsiLOIsBxPYRojadE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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