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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76f52759e6f08d70031234f99330fe575cf35f67d79509f0647a52a3cf67dd18' 
  AND token = 'cIW5HXFrF/SJYNCwXZReYrCuCSpWym3J5faB99akinw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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