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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a6a86ca236e0e109f2b01cf72ae1a8ec0f77d20dadf7685a0e06804a4652b16' 
  AND token = 'gseO3IvZ7tjSCb8zhTUDuopMF3QQ3fuABFyfIgMIaXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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