SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86ba0e16e60953d58902b48b4f970a2efdd1d6b704dcbfc28bc1b9345c7500e0' 
  AND token = 'LVbuaKjT8USszrcZAVB4n1sRDK5lZQW8KHlBuzmlguQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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