SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ae03597b3047be06022e3a579bb32379c57c2fd68825d2464ceb77c5fcd6e41' 
  AND token = 'Kh2FEvtugBzTG5sYlFbV+mRjTfxUvVCuF8y0l0xN1E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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