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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '147c2bc595922a512a5e55d76cb5849ba3e4d34895fce97ccb9c35f2b1a2e20f' 
  AND token = 'vKiCZi8utkWdGBYu9Y0CrzdmcqenMFEGvF9339CVKLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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