SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'feba23aeaac69a2423e85b8db1f366c3ce98fe857253b9c3bc21a79a3c2760be' 
  AND token = 'fzPRX7s+oOLI6WwFl/V7FiCnVyGrzhYq+oB285m9AEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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