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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9204816c586588c8735076b863494a1f55d895178243a418e219e8c751b42aa' 
  AND token = 'Sxj3KOlAF2lNSlgy3U6RtHSSzEZ4pE1fv5KhOM5XnlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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