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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58612d19c93790c400ca6be447bd49f1fe5c76b8800fc1668a96cf7b577fa304' 
  AND token = 'KvP5AxvY6ZZ0TdhGC0drE4jxPPidx45ya7N5wwcAANs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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