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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8debe5bf07ec286fafe4edd7bea306f268c84fc90028bf544c0a9ecd8f4f9200' 
  AND token = 'qAzyLFnKRon2k8Ar1x9S0YhMnv1bys2KjLu6XBF/NK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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