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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3dca1a156350a49f167cd3575f7b0b387e36564dcd916a3439239ea36252aaa' 
  AND token = 'gyuOKptyWseil6BzdgB+c7zfFvtl4JH5eDVV9EPu5fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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