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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3af9c905cd0bd6c8d8071988904c7562e15e143cf7fde6b6b0cbd7209a473da0' 
  AND token = 'zHdNRzBnKLFQB67t4XjBbxq0LJqli1m1pMgQFkmdJc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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