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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28d07883452b2a0ad5d8b482c50b2259545aa4822d0a8e77c7295f9031e89aed' 
  AND token = 'JTy4T0guVc0XGLO7Al91Qfm4lpAkxRi8xNSrkFbaTWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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