SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9634572d045338a1e130218862df1a5f79b81758cefb8d2a874463b21b5b216' 
  AND token = 'BfgbhBz+M4iZ473vAKragAL0F/5MW0fx+6+fUY9v25M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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