SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19bc8c763f131900cd6e355b7c015811168d23365096fa74eea956d44446f9bb' 
  AND token = 'sPVPEMJu0jqKx3G0Oz5HD23H9s57bZFx7nkH2T+I08w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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