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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd1c304ad566eb937d7405bc527812209ee40311dfd7929a1e789bdb6e27eeeb' 
  AND token = 'PdfXC7yDLGTv20oaoCj1dI0KLKHKlrKQDdXAOjJzZ84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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