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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0726166e693dd64eff88001cf069780c9056d48d67dbfd329d04f07a9c7befc6' 
  AND token = '8MTv1zMSZ+y4UvaP6N7cKcCPvSyuLvxvcpeq+GvgO/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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