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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e93a5051d13f29c86057ceeeb8a390f31e023b25e1479ef76cfca664d6a13e67' 
  AND token = 'TnvXkWKCR6a5ujMKgZoXgVoWWAkK5bxZrw7fUivjxQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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