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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dc0d36d17031e9d30f5190171be7ba4a423833390f61cd0caf832ba47519511' 
  AND token = 'bqB77nC+vFfXc3bMntdkKn5WLFlJXyZOI0JDzqxoyKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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