SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '980267f1576bfb5d8830286c8e5af73a5823382b12035c9043b2df4e84c3fc83' 
  AND token = 'KIKuz7TlRzQP+iwlzapDHH7Z4TYyO6poQ2shQ9RYSQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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