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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfb5455c2a3c414c7f6ed4b92ed146718a61b86d75a9e4a02a12d28be0ff2ab8' 
  AND token = 'UPyyuTiit/USINHKWbw7dj26+1QSfgOrLDrZs5MCRjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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