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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fd13f67200e4ec1eb94664f45f109a066ef91deb755a0891832040f2b803bfa' 
  AND token = 'w6MiT2A92clknA1w0u5FZL0rorRkJHGmlka64FRiqF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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