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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45a58ac09a40211c1620be606b6d3a4fa4e5ea7c974ede7bd3f7adce5904878e' 
  AND token = 'q8YqaBWVds2T2Bk3P/+V8NLWzV+e4R7ZqOYa8aEqn3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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