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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc0718b37e91dc536e92687d6bba76fc9934ea63e7e8899484dc633dc70f8f98' 
  AND token = 'nV/NxUCl/ltgHozg28Si39wIYNPjfYr338xr7C/Kt5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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