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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33c26f02f02a7276c523ad421255fe74d352e620605709f10c1ae5a88ce66aac' 
  AND token = 'grAqGjF7QZx+w/73qxy0ND0acZqI1X36UEFx3hCkdXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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