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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d61d84d57307d738163b5ef1ba853d3876b018f21753f9ea70ae5af283813d1' 
  AND token = 'LbD4EsLsCzQpW8AhgkgZScy7tIWuntqS06t1rns6Sws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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