SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '772557cff4771ba344a0057cf1d9e69bf42db881ff33f3a7f94f70cbec8521d8' 
  AND token = 'gI1hJ9Lmp0aUO1rHeM0PnJEugfTgZ6vk+Z3xqMcB7Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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