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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '519d9072de782cf6d71d841f4fc7d4bd2e15c7a25b261bb35f8328b242684f56' 
  AND token = 'tKNPZY9sVddsCo5ur4WEHO0VDZJLLsEaiZ9+YJG01D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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