SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd80dfba8fc7cd2e6c4e5dd3116b4358a710b1fa2abf06966558b8fb2fa179d0' 
  AND token = 'L+o+FtsUmcbT8IL8HV57Z+9sWjwOmgoBqJQ3JX5DFoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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