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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '717f1eb309e8f54ea983529c1dd7ffabccffa02e761308abfab215106a720db9' 
  AND token = 'KPR2V1BnePxgdDdJ9cybeURa+e0/kV8NNQC84EOqxTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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