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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b9e2e5a95131489ef711f17c5b26fff7b57011dbe8c605eef0bb32188981ad9' 
  AND token = 'Diu1ysKxHp3u5v86CFEtNfkvuE3XKAF4OvlZB0FWUFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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