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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '933b74cd5c2bcbc41c37913263bd156dcae5d1df3508d2e6327572c7add1c47d' 
  AND token = '5tjwpWoIIT5SHooY3LGeMpGo4BZH1tMsJtXYEMlmkWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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