SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb88dff409466727c098abad83ee83e4b4e940c492217bf426fce4e5f464c16d' 
  AND token = 'z5pCAfBVdhZSlaU4ImKhY01OxyZnwYB+0O5h16OGS7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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