SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8401bfd4ec5169103b3adf30e61b57dd78f9336b74c9ec707d76eba9054256e8' 
  AND token = 'zDnUa0qD39iac8HdZg+vU14VcVNB2yW4RACzgK8BVus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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