SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70b3b207cec93f2c9b07409ebb381e482219f211956f7a36a45869f75f0b7c44' 
  AND token = 'I5vMH7B7PBCLABshGxhGnlcj+/FSnqfbQodvz65JSUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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